Approximately how many years would it take for an investment to grow threefold if it were invested at 15 percent compounded semiannually​? Assume that you invest ​$1 today. Question content area bottom Part 1 If you invest ​$1 at 15 percent compounded semiannually​, about how many years would it take for your investment to grow threefold to ​$3​? ​(Hint​: Remember to convert your calculator solution to​ years.)